Severe Thunderstorm Watch 252

Issued

Jun 4, 2020, 2:27 PM MDT (20:27 UTC)

Expired

Jun 4, 2020, 10:00 PM MDT

In force

8 hr

Issued by

the Storm Prediction Center

Largest hail expected

3 in

Strongest gust expected

65 kt

The Rapid City radar (KUDX), 102 km from the middle of the area, began a volume at 20:29 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

Two or more tornadoes

20%

One or more EF2 to EF5 tornadoes

5%

Ten or more severe wind reports

40%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

70%

One or more hailstones of 2 inches or more

70%

Six or more combined severe hail and wind reports

90%

• Mesoscale Discussion 817 Severe potential...watch likelyJun 4, 1:25 PM MDT
• Mesoscale Discussion 826 Severe thunderstorm watch 252Jun 4, 5:55 PM MDT
• Mesoscale Discussion 832 Severe thunderstorm watch 252Jun 4, 9:24 PM MDT

563 
WWUS20 KWNS 042024
SEL2  
SPC WW 042024
MTZ000-SDZ000-WYZ000-050400-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 252
NWS Storm Prediction Center Norman OK
225 PM MDT Thu Jun 4 2020

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  Far southeast Montana
  Western and central South Dakota
  Far northeast Wyoming

* Effective this Thursday afternoon and evening from 225 PM until
  1000 PM MDT.

* Primary threats include...
  Scattered large hail and isolated very large hail events to 3
    inches in diameter likely
  Scattered damaging winds and isolated significant gusts to 75
    mph possible
  A tornado or two possible

SUMMARY...Multiple supercells should develop near the South Dakota,
Montana, Wyoming border area and spread east-southeast into central
South Dakota this evening. A couple of these supercells may be
long-tracked with potential for elongated swaths of large hail. A
tornado or two is also possible, mainly across western into
south-central South Dakota.

The severe thunderstorm watch area is approximately along and 65
statute miles north and south of a line from 90 miles west of
Buffalo SD to 50 miles south southeast of Pierre SD. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU2).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A Severe Thunderstorm Watch means conditions are
favorable for severe thunderstorms in and close to the watch area.
Persons in these areas should be on the lookout for threatening
weather conditions and listen for later statements and possible
warnings. Severe thunderstorms can and occasionally do produce
tornadoes.

&&

OTHER WATCH INFORMATION...CONTINUE...WW 249...WW 250...WW 251...

AVIATION...A few severe thunderstorms with hail surface and aloft to
3 inches. Extreme turbulence and surface wind gusts to 65 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
29040.

...Grams

Severe Thunderstorm Watches in South Dakota, 2020Severe Thunderstorm Watches in Montana, 2020Severe Thunderstorm Watches in Wyoming, 2020Every severe thunderstorm watch in 2020

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.